Synthesis and Structure of Heterometallic Palladium and Iron Complexes

Heterometallic palladium(II) complexes with ferrocenecarboxylic acid FcCOOH were synthesized and structurally characterized for the first time. The reactions of mononuclear [Pd(Py)2(OOCMe)2] and [Pd(Phen)(OOCMe)2] complexes with FcCOOH were accompanied by easy displacement of acetate anions from the inner sphere by the ferrocenecarboxylate anions to give iron-containing molecular palladium complexes: three solvatomorphs of [Pd(Py)2(FcCOO)2] with benzene (I, II) and dichloromethane (III); the use of [Pd(Phen)(OOCMe)2] as the starting compound resulted in the formation of the heteroligand acetate ferrocenecarboxylate [Pd(Phen)(FcCOO)2Pd(Phen)(FcCOO)(OOCMe)] (IV). Fully substituted [Pd(Phen)(FcCOO)2] (V) was prepared by successive treatment of palladium acetate [Pd3(OOCMe)6] with FcCOOH and 1,10-phenanthroline. The structures of complexes I–V were studied by X-ray diffraction (CIF files CCDC nos. 2078399–2078403).